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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b135b0b38461e0203f61f173c6532a9fe03d9178e7641ecb1de331a7bb3dca45' 
  AND token = 'Ap4pRR9Xb8Mvz10KDVsOkGnQLWn3VGQ1K8sAcJELEnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}